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<pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a>
<span class="sourceLineNo">002</span> * Copyright (C) 2008 The Guava Authors<a name="line.2"></a>
<span class="sourceLineNo">003</span> *<a name="line.3"></a>
<span class="sourceLineNo">004</span> * Licensed under the Apache License, Version 2.0 (the "License");<a name="line.4"></a>
<span class="sourceLineNo">005</span> * you may not use this file except in compliance with the License.<a name="line.5"></a>
<span class="sourceLineNo">006</span> * You may obtain a copy of the License at<a name="line.6"></a>
<span class="sourceLineNo">007</span> *<a name="line.7"></a>
<span class="sourceLineNo">008</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.8"></a>
<span class="sourceLineNo">009</span> *<a name="line.9"></a>
<span class="sourceLineNo">010</span> * Unless required by applicable law or agreed to in writing, software<a name="line.10"></a>
<span class="sourceLineNo">011</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.11"></a>
<span class="sourceLineNo">012</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.12"></a>
<span class="sourceLineNo">013</span> * See the License for the specific language governing permissions and<a name="line.13"></a>
<span class="sourceLineNo">014</span> * limitations under the License.<a name="line.14"></a>
<span class="sourceLineNo">015</span> */<a name="line.15"></a>
<span class="sourceLineNo">016</span><a name="line.16"></a>
<span class="sourceLineNo">017</span>package com.google.common.base;<a name="line.17"></a>
<span class="sourceLineNo">018</span><a name="line.18"></a>
<span class="sourceLineNo">019</span>import static com.google.common.base.Preconditions.checkNotNull;<a name="line.19"></a>
<span class="sourceLineNo">020</span><a name="line.20"></a>
<span class="sourceLineNo">021</span>import com.google.common.annotations.Beta;<a name="line.21"></a>
<span class="sourceLineNo">022</span>import com.google.common.annotations.GwtCompatible;<a name="line.22"></a>
<span class="sourceLineNo">023</span><a name="line.23"></a>
<span class="sourceLineNo">024</span>import java.io.IOException;<a name="line.24"></a>
<span class="sourceLineNo">025</span>import java.util.AbstractList;<a name="line.25"></a>
<span class="sourceLineNo">026</span>import java.util.Arrays;<a name="line.26"></a>
<span class="sourceLineNo">027</span>import java.util.Iterator;<a name="line.27"></a>
<span class="sourceLineNo">028</span>import java.util.Map;<a name="line.28"></a>
<span class="sourceLineNo">029</span>import java.util.Map.Entry;<a name="line.29"></a>
<span class="sourceLineNo">030</span><a name="line.30"></a>
<span class="sourceLineNo">031</span>import javax.annotation.CheckReturnValue;<a name="line.31"></a>
<span class="sourceLineNo">032</span>import javax.annotation.Nullable;<a name="line.32"></a>
<span class="sourceLineNo">033</span><a name="line.33"></a>
<span class="sourceLineNo">034</span>/**<a name="line.34"></a>
<span class="sourceLineNo">035</span> * An object which joins pieces of text (specified as an array, {@link Iterable}, varargs or even a<a name="line.35"></a>
<span class="sourceLineNo">036</span> * {@link Map}) with a separator. It either appends the results to an {@link Appendable} or returns<a name="line.36"></a>
<span class="sourceLineNo">037</span> * them as a {@link String}. Example: &lt;pre&gt;   {@code<a name="line.37"></a>
<span class="sourceLineNo">038</span> *<a name="line.38"></a>
<span class="sourceLineNo">039</span> *   Joiner joiner = Joiner.on("; ").skipNulls();<a name="line.39"></a>
<span class="sourceLineNo">040</span> *    . . .<a name="line.40"></a>
<span class="sourceLineNo">041</span> *   return joiner.join("Harry", null, "Ron", "Hermione");}&lt;/pre&gt;<a name="line.41"></a>
<span class="sourceLineNo">042</span> *<a name="line.42"></a>
<span class="sourceLineNo">043</span> * This returns the string {@code "Harry; Ron; Hermione"}. Note that all input elements are<a name="line.43"></a>
<span class="sourceLineNo">044</span> * converted to strings using {@link Object#toString()} before being appended.<a name="line.44"></a>
<span class="sourceLineNo">045</span> *<a name="line.45"></a>
<span class="sourceLineNo">046</span> * &lt;p&gt;If neither {@link #skipNulls()} nor {@link #useForNull(String)} is specified, the joining<a name="line.46"></a>
<span class="sourceLineNo">047</span> * methods will throw {@link NullPointerException} if any given element is null.<a name="line.47"></a>
<span class="sourceLineNo">048</span> *<a name="line.48"></a>
<span class="sourceLineNo">049</span> * &lt;p&gt;&lt;b&gt;Warning: joiner instances are always immutable&lt;/b&gt;; a configuration method such as {@code<a name="line.49"></a>
<span class="sourceLineNo">050</span> * useForNull} has no effect on the instance it is invoked on! You must store and use the new joiner<a name="line.50"></a>
<span class="sourceLineNo">051</span> * instance returned by the method. This makes joiners thread-safe, and safe to store as {@code<a name="line.51"></a>
<span class="sourceLineNo">052</span> * static final} constants. &lt;pre&gt;   {@code<a name="line.52"></a>
<span class="sourceLineNo">053</span> *<a name="line.53"></a>
<span class="sourceLineNo">054</span> *   // Bad! Do not do this!<a name="line.54"></a>
<span class="sourceLineNo">055</span> *   Joiner joiner = Joiner.on(',');<a name="line.55"></a>
<span class="sourceLineNo">056</span> *   joiner.skipNulls(); // does nothing!<a name="line.56"></a>
<span class="sourceLineNo">057</span> *   return joiner.join("wrong", null, "wrong");}&lt;/pre&gt;<a name="line.57"></a>
<span class="sourceLineNo">058</span> *<a name="line.58"></a>
<span class="sourceLineNo">059</span> * &lt;p&gt;See the Guava User Guide article on &lt;a href=<a name="line.59"></a>
<span class="sourceLineNo">060</span> * "http://code.google.com/p/guava-libraries/wiki/StringsExplained#Joiner"&gt;{@code Joiner}&lt;/a&gt;.<a name="line.60"></a>
<span class="sourceLineNo">061</span> *<a name="line.61"></a>
<span class="sourceLineNo">062</span> * @author Kevin Bourrillion<a name="line.62"></a>
<span class="sourceLineNo">063</span> * @since 2.0 (imported from Google Collections Library)<a name="line.63"></a>
<span class="sourceLineNo">064</span> */<a name="line.64"></a>
<span class="sourceLineNo">065</span>@GwtCompatible<a name="line.65"></a>
<span class="sourceLineNo">066</span>public class Joiner {<a name="line.66"></a>
<span class="sourceLineNo">067</span>  /**<a name="line.67"></a>
<span class="sourceLineNo">068</span>   * Returns a joiner which automatically places {@code separator} between consecutive elements.<a name="line.68"></a>
<span class="sourceLineNo">069</span>   */<a name="line.69"></a>
<span class="sourceLineNo">070</span>  public static Joiner on(String separator) {<a name="line.70"></a>
<span class="sourceLineNo">071</span>    return new Joiner(separator);<a name="line.71"></a>
<span class="sourceLineNo">072</span>  }<a name="line.72"></a>
<span class="sourceLineNo">073</span><a name="line.73"></a>
<span class="sourceLineNo">074</span>  /**<a name="line.74"></a>
<span class="sourceLineNo">075</span>   * Returns a joiner which automatically places {@code separator} between consecutive elements.<a name="line.75"></a>
<span class="sourceLineNo">076</span>   */<a name="line.76"></a>
<span class="sourceLineNo">077</span>  public static Joiner on(char separator) {<a name="line.77"></a>
<span class="sourceLineNo">078</span>    return new Joiner(String.valueOf(separator));<a name="line.78"></a>
<span class="sourceLineNo">079</span>  }<a name="line.79"></a>
<span class="sourceLineNo">080</span><a name="line.80"></a>
<span class="sourceLineNo">081</span>  private final String separator;<a name="line.81"></a>
<span class="sourceLineNo">082</span><a name="line.82"></a>
<span class="sourceLineNo">083</span>  private Joiner(String separator) {<a name="line.83"></a>
<span class="sourceLineNo">084</span>    this.separator = checkNotNull(separator);<a name="line.84"></a>
<span class="sourceLineNo">085</span>  }<a name="line.85"></a>
<span class="sourceLineNo">086</span><a name="line.86"></a>
<span class="sourceLineNo">087</span>  private Joiner(Joiner prototype) {<a name="line.87"></a>
<span class="sourceLineNo">088</span>    this.separator = prototype.separator;<a name="line.88"></a>
<span class="sourceLineNo">089</span>  }<a name="line.89"></a>
<span class="sourceLineNo">090</span><a name="line.90"></a>
<span class="sourceLineNo">091</span>  /**<a name="line.91"></a>
<span class="sourceLineNo">092</span>   * &lt;b&gt;Deprecated.&lt;/b&gt;<a name="line.92"></a>
<span class="sourceLineNo">093</span>   *<a name="line.93"></a>
<span class="sourceLineNo">094</span>   * @since 11.0<a name="line.94"></a>
<span class="sourceLineNo">095</span>   * @deprecated use {@link #appendTo(Appendable, Iterator)} by casting {@code parts} to<a name="line.95"></a>
<span class="sourceLineNo">096</span>   *     {@code Iterator&lt;?&gt;}, or better yet, by implementing only {@code Iterator} and not<a name="line.96"></a>
<span class="sourceLineNo">097</span>   *     {@code Iterable}. &lt;b&gt;This method is scheduled for deletion in June 2013.&lt;/b&gt;<a name="line.97"></a>
<span class="sourceLineNo">098</span>   */<a name="line.98"></a>
<span class="sourceLineNo">099</span>  @Beta<a name="line.99"></a>
<span class="sourceLineNo">100</span>  @Deprecated<a name="line.100"></a>
<span class="sourceLineNo">101</span>  public<a name="line.101"></a>
<span class="sourceLineNo">102</span>  final &lt;A extends Appendable, I extends Object &amp; Iterable&lt;?&gt; &amp; Iterator&lt;?&gt;&gt; A<a name="line.102"></a>
<span class="sourceLineNo">103</span>      appendTo(A appendable, I parts) throws IOException {<a name="line.103"></a>
<span class="sourceLineNo">104</span>    return appendTo(appendable, (Iterator&lt;?&gt;) parts);<a name="line.104"></a>
<span class="sourceLineNo">105</span>  }<a name="line.105"></a>
<span class="sourceLineNo">106</span><a name="line.106"></a>
<span class="sourceLineNo">107</span>  /**<a name="line.107"></a>
<span class="sourceLineNo">108</span>   * Appends the string representation of each of {@code parts}, using the previously configured<a name="line.108"></a>
<span class="sourceLineNo">109</span>   * separator between each, to {@code appendable}.<a name="line.109"></a>
<span class="sourceLineNo">110</span>   */<a name="line.110"></a>
<span class="sourceLineNo">111</span>  public &lt;A extends Appendable&gt; A appendTo(A appendable, Iterable&lt;?&gt; parts) throws IOException {<a name="line.111"></a>
<span class="sourceLineNo">112</span>    return appendTo(appendable, parts.iterator());<a name="line.112"></a>
<span class="sourceLineNo">113</span>  }<a name="line.113"></a>
<span class="sourceLineNo">114</span><a name="line.114"></a>
<span class="sourceLineNo">115</span>  /**<a name="line.115"></a>
<span class="sourceLineNo">116</span>   * Appends the string representation of each of {@code parts}, using the previously configured<a name="line.116"></a>
<span class="sourceLineNo">117</span>   * separator between each, to {@code appendable}.<a name="line.117"></a>
<span class="sourceLineNo">118</span>   *<a name="line.118"></a>
<span class="sourceLineNo">119</span>   * @since 11.0<a name="line.119"></a>
<span class="sourceLineNo">120</span>   */<a name="line.120"></a>
<span class="sourceLineNo">121</span>  public &lt;A extends Appendable&gt; A appendTo(A appendable, Iterator&lt;?&gt; parts) throws IOException {<a name="line.121"></a>
<span class="sourceLineNo">122</span>    checkNotNull(appendable);<a name="line.122"></a>
<span class="sourceLineNo">123</span>    if (parts.hasNext()) {<a name="line.123"></a>
<span class="sourceLineNo">124</span>      appendable.append(toString(parts.next()));<a name="line.124"></a>
<span class="sourceLineNo">125</span>      while (parts.hasNext()) {<a name="line.125"></a>
<span class="sourceLineNo">126</span>        appendable.append(separator);<a name="line.126"></a>
<span class="sourceLineNo">127</span>        appendable.append(toString(parts.next()));<a name="line.127"></a>
<span class="sourceLineNo">128</span>      }<a name="line.128"></a>
<span class="sourceLineNo">129</span>    }<a name="line.129"></a>
<span class="sourceLineNo">130</span>    return appendable;<a name="line.130"></a>
<span class="sourceLineNo">131</span>  }<a name="line.131"></a>
<span class="sourceLineNo">132</span><a name="line.132"></a>
<span class="sourceLineNo">133</span>  /**<a name="line.133"></a>
<span class="sourceLineNo">134</span>   * Appends the string representation of each of {@code parts}, using the previously configured<a name="line.134"></a>
<span class="sourceLineNo">135</span>   * separator between each, to {@code appendable}.<a name="line.135"></a>
<span class="sourceLineNo">136</span>   */<a name="line.136"></a>
<span class="sourceLineNo">137</span>  public final &lt;A extends Appendable&gt; A appendTo(A appendable, Object[] parts) throws IOException {<a name="line.137"></a>
<span class="sourceLineNo">138</span>    return appendTo(appendable, Arrays.asList(parts));<a name="line.138"></a>
<span class="sourceLineNo">139</span>  }<a name="line.139"></a>
<span class="sourceLineNo">140</span><a name="line.140"></a>
<span class="sourceLineNo">141</span>  /**<a name="line.141"></a>
<span class="sourceLineNo">142</span>   * Appends to {@code appendable} the string representation of each of the remaining arguments.<a name="line.142"></a>
<span class="sourceLineNo">143</span>   */<a name="line.143"></a>
<span class="sourceLineNo">144</span>  public final &lt;A extends Appendable&gt; A appendTo(<a name="line.144"></a>
<span class="sourceLineNo">145</span>      A appendable, @Nullable Object first, @Nullable Object second, Object... rest)<a name="line.145"></a>
<span class="sourceLineNo">146</span>          throws IOException {<a name="line.146"></a>
<span class="sourceLineNo">147</span>    return appendTo(appendable, iterable(first, second, rest));<a name="line.147"></a>
<span class="sourceLineNo">148</span>  }<a name="line.148"></a>
<span class="sourceLineNo">149</span><a name="line.149"></a>
<span class="sourceLineNo">150</span>  /**<a name="line.150"></a>
<span class="sourceLineNo">151</span>   * &lt;b&gt;Deprecated.&lt;/b&gt;<a name="line.151"></a>
<span class="sourceLineNo">152</span>   *<a name="line.152"></a>
<span class="sourceLineNo">153</span>   * @since 11.0<a name="line.153"></a>
<span class="sourceLineNo">154</span>   * @deprecated use {@link #appendTo(StringBuilder, Iterator)} by casting {@code parts} to<a name="line.154"></a>
<span class="sourceLineNo">155</span>   *     {@code Iterator&lt;?&gt;}, or better yet, by implementing only {@code Iterator} and not<a name="line.155"></a>
<span class="sourceLineNo">156</span>   *     {@code Iterable}. &lt;b&gt;This method is scheduled for deletion in June 2013.&lt;/b&gt;<a name="line.156"></a>
<span class="sourceLineNo">157</span>   */<a name="line.157"></a>
<span class="sourceLineNo">158</span>  @Beta<a name="line.158"></a>
<span class="sourceLineNo">159</span>  @Deprecated<a name="line.159"></a>
<span class="sourceLineNo">160</span>  public<a name="line.160"></a>
<span class="sourceLineNo">161</span>  final &lt;I extends Object &amp; Iterable&lt;?&gt; &amp; Iterator&lt;?&gt;&gt; StringBuilder<a name="line.161"></a>
<span class="sourceLineNo">162</span>      appendTo(StringBuilder builder, I parts) {<a name="line.162"></a>
<span class="sourceLineNo">163</span>    return appendTo(builder, (Iterator&lt;?&gt;) parts);<a name="line.163"></a>
<span class="sourceLineNo">164</span>  }<a name="line.164"></a>
<span class="sourceLineNo">165</span><a name="line.165"></a>
<span class="sourceLineNo">166</span>  /**<a name="line.166"></a>
<span class="sourceLineNo">167</span>   * Appends the string representation of each of {@code parts}, using the previously configured<a name="line.167"></a>
<span class="sourceLineNo">168</span>   * separator between each, to {@code builder}. Identical to {@link #appendTo(Appendable,<a name="line.168"></a>
<span class="sourceLineNo">169</span>   * Iterable)}, except that it does not throw {@link IOException}.<a name="line.169"></a>
<span class="sourceLineNo">170</span>   */<a name="line.170"></a>
<span class="sourceLineNo">171</span>  public final StringBuilder appendTo(StringBuilder builder, Iterable&lt;?&gt; parts) {<a name="line.171"></a>
<span class="sourceLineNo">172</span>    return appendTo(builder, parts.iterator());<a name="line.172"></a>
<span class="sourceLineNo">173</span>  }<a name="line.173"></a>
<span class="sourceLineNo">174</span><a name="line.174"></a>
<span class="sourceLineNo">175</span>  /**<a name="line.175"></a>
<span class="sourceLineNo">176</span>   * Appends the string representation of each of {@code parts}, using the previously configured<a name="line.176"></a>
<span class="sourceLineNo">177</span>   * separator between each, to {@code builder}. Identical to {@link #appendTo(Appendable,<a name="line.177"></a>
<span class="sourceLineNo">178</span>   * Iterable)}, except that it does not throw {@link IOException}.<a name="line.178"></a>
<span class="sourceLineNo">179</span>   *<a name="line.179"></a>
<span class="sourceLineNo">180</span>   * @since 11.0<a name="line.180"></a>
<span class="sourceLineNo">181</span>   */<a name="line.181"></a>
<span class="sourceLineNo">182</span>  public final StringBuilder appendTo(StringBuilder builder, Iterator&lt;?&gt; parts) {<a name="line.182"></a>
<span class="sourceLineNo">183</span>    try {<a name="line.183"></a>
<span class="sourceLineNo">184</span>      appendTo((Appendable) builder, parts);<a name="line.184"></a>
<span class="sourceLineNo">185</span>    } catch (IOException impossible) {<a name="line.185"></a>
<span class="sourceLineNo">186</span>      throw new AssertionError(impossible);<a name="line.186"></a>
<span class="sourceLineNo">187</span>    }<a name="line.187"></a>
<span class="sourceLineNo">188</span>    return builder;<a name="line.188"></a>
<span class="sourceLineNo">189</span>  }<a name="line.189"></a>
<span class="sourceLineNo">190</span><a name="line.190"></a>
<span class="sourceLineNo">191</span>  /**<a name="line.191"></a>
<span class="sourceLineNo">192</span>   * Appends the string representation of each of {@code parts}, using the previously configured<a name="line.192"></a>
<span class="sourceLineNo">193</span>   * separator between each, to {@code builder}. Identical to {@link #appendTo(Appendable,<a name="line.193"></a>
<span class="sourceLineNo">194</span>   * Iterable)}, except that it does not throw {@link IOException}.<a name="line.194"></a>
<span class="sourceLineNo">195</span>   */<a name="line.195"></a>
<span class="sourceLineNo">196</span>  public final StringBuilder appendTo(StringBuilder builder, Object[] parts) {<a name="line.196"></a>
<span class="sourceLineNo">197</span>    return appendTo(builder, Arrays.asList(parts));<a name="line.197"></a>
<span class="sourceLineNo">198</span>  }<a name="line.198"></a>
<span class="sourceLineNo">199</span><a name="line.199"></a>
<span class="sourceLineNo">200</span>  /**<a name="line.200"></a>
<span class="sourceLineNo">201</span>   * Appends to {@code builder} the string representation of each of the remaining arguments.<a name="line.201"></a>
<span class="sourceLineNo">202</span>   * Identical to {@link #appendTo(Appendable, Object, Object, Object...)}, except that it does not<a name="line.202"></a>
<span class="sourceLineNo">203</span>   * throw {@link IOException}.<a name="line.203"></a>
<span class="sourceLineNo">204</span>   */<a name="line.204"></a>
<span class="sourceLineNo">205</span>  public final StringBuilder appendTo(<a name="line.205"></a>
<span class="sourceLineNo">206</span>      StringBuilder builder, @Nullable Object first, @Nullable Object second, Object... rest) {<a name="line.206"></a>
<span class="sourceLineNo">207</span>    return appendTo(builder, iterable(first, second, rest));<a name="line.207"></a>
<span class="sourceLineNo">208</span>  }<a name="line.208"></a>
<span class="sourceLineNo">209</span><a name="line.209"></a>
<span class="sourceLineNo">210</span>  /**<a name="line.210"></a>
<span class="sourceLineNo">211</span>   * &lt;b&gt;Deprecated.&lt;/b&gt;<a name="line.211"></a>
<span class="sourceLineNo">212</span>   *<a name="line.212"></a>
<span class="sourceLineNo">213</span>   * @since 11.0<a name="line.213"></a>
<span class="sourceLineNo">214</span>   * @deprecated use {@link #join(Iterator)} by casting {@code parts} to<a name="line.214"></a>
<span class="sourceLineNo">215</span>   *     {@code Iterator&lt;?&gt;}, or better yet, by implementing only {@code Iterator} and not<a name="line.215"></a>
<span class="sourceLineNo">216</span>   *     {@code Iterable}. &lt;b&gt;This method is scheduled for deletion in June 2013.&lt;/b&gt;<a name="line.216"></a>
<span class="sourceLineNo">217</span>   */<a name="line.217"></a>
<span class="sourceLineNo">218</span>  @Beta<a name="line.218"></a>
<span class="sourceLineNo">219</span>  @Deprecated<a name="line.219"></a>
<span class="sourceLineNo">220</span>  public<a name="line.220"></a>
<span class="sourceLineNo">221</span>  final &lt;I extends Object &amp; Iterable&lt;?&gt; &amp; Iterator&lt;?&gt;&gt; String join(I parts) {<a name="line.221"></a>
<span class="sourceLineNo">222</span>    return join((Iterator&lt;?&gt;) parts);<a name="line.222"></a>
<span class="sourceLineNo">223</span>  }<a name="line.223"></a>
<span class="sourceLineNo">224</span><a name="line.224"></a>
<span class="sourceLineNo">225</span>  /**<a name="line.225"></a>
<span class="sourceLineNo">226</span>   * Returns a string containing the string representation of each of {@code parts}, using the<a name="line.226"></a>
<span class="sourceLineNo">227</span>   * previously configured separator between each.<a name="line.227"></a>
<span class="sourceLineNo">228</span>   */<a name="line.228"></a>
<span class="sourceLineNo">229</span>  public final String join(Iterable&lt;?&gt; parts) {<a name="line.229"></a>
<span class="sourceLineNo">230</span>    return join(parts.iterator());<a name="line.230"></a>
<span class="sourceLineNo">231</span>  }<a name="line.231"></a>
<span class="sourceLineNo">232</span><a name="line.232"></a>
<span class="sourceLineNo">233</span>  /**<a name="line.233"></a>
<span class="sourceLineNo">234</span>   * Returns a string containing the string representation of each of {@code parts}, using the<a name="line.234"></a>
<span class="sourceLineNo">235</span>   * previously configured separator between each.<a name="line.235"></a>
<span class="sourceLineNo">236</span>   *<a name="line.236"></a>
<span class="sourceLineNo">237</span>   * @since 11.0<a name="line.237"></a>
<span class="sourceLineNo">238</span>   */<a name="line.238"></a>
<span class="sourceLineNo">239</span>  public final String join(Iterator&lt;?&gt; parts) {<a name="line.239"></a>
<span class="sourceLineNo">240</span>    return appendTo(new StringBuilder(), parts).toString();<a name="line.240"></a>
<span class="sourceLineNo">241</span>  }<a name="line.241"></a>
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